CN110939395A - Construction equipment and method for variable-diameter plain concrete pile - Google Patents
Construction equipment and method for variable-diameter plain concrete pile Download PDFInfo
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- CN110939395A CN110939395A CN201911314710.0A CN201911314710A CN110939395A CN 110939395 A CN110939395 A CN 110939395A CN 201911314710 A CN201911314710 A CN 201911314710A CN 110939395 A CN110939395 A CN 110939395A
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- 238000010276 construction Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005553 drilling Methods 0.000 claims abstract description 56
- 239000002689 soil Substances 0.000 claims description 11
- 230000000717 retained effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to construction equipment and a method of a variable-diameter plain concrete pile, wherein the equipment comprises a drilling machine and a spiral drill rod A, wherein a drill bit is fixedly arranged at the bottom of the spiral drill rod A, and a flange plate C is fixedly arranged at the bottom of a power head of the drilling machine; the spiral drill pipe comprises a spiral drill pipe B, an upper connecting piece, a lower connecting piece and a fixing device; the method comprises the steps of sleeving the auger stem A1 into the inner cavity of the auger stem B2, drilling, concrete pressure-pouring and drill lifting, the construction equipment is simple to manufacture, convenient to operate, reliable in performance and low in use cost, and the method meets the requirements of design on the bearing capacity of the foundation and deformation and settlement and achieves the aim of saving the construction cost to the maximum extent.
Description
Technical Field
The invention relates to construction equipment and a construction method of a variable-diameter plain concrete pile.
Background
In recent years, the processing method of the variable-diameter plain concrete pile composite foundation is correspondingly standardized, the bearing capacity of a single pile of the variable-diameter plain concrete pile with the same concrete volume is greatly improved compared with that of a pile with a uniform cross section, and the cost for foundation processing can be greatly reduced. However, corresponding mechanical drilling tools in the current market are immature, and some drilling tools are complex in structure and high in manufacturing cost, so that the drilling machine is easy to damage in the construction process, the maintenance cost is increased, and the construction period is prolonged; some drilling machines have design defects, so that the problem that the deficient soil is reserved at the variable-diameter part in the construction process cannot be solved, the design requirements cannot be met, and the popularization progress of the variable-diameter plain concrete pile composite foundation is slow.
Disclosure of Invention
The invention aims to solve the technical problem of providing the construction equipment and the construction method for the reducing plain concrete pile, which have the advantages of simple manufacture, convenient operation, reliable performance and low use cost.
The invention adopts the following technical scheme:
the diameter-variable plain concrete pile construction equipment comprises a drilling machine and a spiral drill rod A, wherein a drill bit is fixedly arranged at the bottom of the spiral drill rod A, and a flange plate C is fixedly arranged at the bottom of a power head of the drilling machine; the spiral drill pipe comprises a spiral drill pipe B, an upper connecting piece, a lower connecting piece and a fixing device; the drill rods of the spiral drill rod A and the spiral drill rod B are both hollow cavities, the length of the spiral drill rod A is 5-25m, and the length of the spiral drill rod B is 0.8-6 m; the inner diameter of a drill rod of the spiral drill rod B) is larger than the outer diameter of a spiral blade of the spiral drill rod A, and the spiral drill rod A is sleeved in the inner cavity of the drill rod of the spiral drill rod B; the upper connecting piece is fixed at the tops of the spiral drill rod A and the spiral drill rod B and matched with the flange plate C, one end of the fixing device is hinged with the upright post of the drilling machine, and the other end of the fixing device is fixedly arranged on the spiral drill rod B; the helical blade at the bottom of the auger stem B is provided with a diameter-variable section with the width being changed from narrow to wide from bottom to top along the helical direction.
The upper connecting piece of the construction equipment comprises a flange A fixedly arranged at the top of a spiral drill rod A and a flange B fixedly arranged at the top of a spiral drill rod B, wherein the inner diameter of the flange B is larger than the outer diameter of the flange A; and the flange A and the flange B are matched with the flange C.
The lower connecting piece of the construction equipment comprises a fixing hole arranged on the upper part of a drill rod B of the spiral drill rod, a U-shaped clamping key inserted in the fixing hole and a clamping block fixed on the outer wall of the drill rod A of the spiral drill rod, wherein the U-shaped clamping key is clamped with the clamping block when inserted in the fixing hole, and the outer wall of the clamping block is provided with a clamping groove.
The construction equipment of the invention has two groups of fixing holes, and two U-shaped clamping keys are respectively inserted into the two groups of fixing holes to be in a vertical state.
The fixing device of the construction equipment comprises an upper hoop arranged at the upper part of a drill rod B of the spiral drill rod and a lower hoop arranged at the lower part of the spiral drill rod B; the other ends of the upper anchor ear and the lower anchor ear are hinged to a drilling machine upright post, the upper anchor ear is matched with the outer wall of the drill rod of the spiral drill rod B, and the lower anchor ear is matched with the spiral blade of the spiral drill rod B.
The outer diameter of the auger A of the construction equipment is 0.18-0.58m, and the outer diameter of the auger B is 0.38-1.18 m.
The spiral blade at the bottom of the spiral drill rod B of the construction equipment is in an inverted frustum shape of 30-45 degrees from bottom to top along the spiral direction, and the height of the inverted frustum is 0.15-0.8 m.
The construction method of the variable-diameter plain concrete pile adopts the following steps:
step one, sleeving a spiral drill rod A into a drill rod inner cavity of a spiral drill rod B, fixing a flange A and a flange C at the top of the spiral drill rod A, tightly holding the upper part of the drill rod of the spiral drill rod B by an upper hoop, and tightly holding a spiral blade of the spiral drill rod B by a lower hoop;
step two, starting the drilling machine, and drilling the spiral drill rod A; when the auger stem A drills to a position where a constructor can conveniently operate and connect the auger stem A and the auger stem B, the drilling machine stops, the flange B at the top end of the auger stem B and the flange C are fixed through bolts, the flange A is located in the inner cavity of the flange B, and the upper anchor ear and the lower anchor ear for fixing the auger stem B are opened;
step three, starting a drilling machine, synchronously continuing drilling by the spiral drill rod A and the spiral drill rod B until the designed diameter-variable plain concrete pile pit is drilled, stopping the drilling machine, detaching the flange plate and the flange plate C, and retaining the spiral drill rod B in the diameter-variable plain concrete pile pit;
step four, pouring concrete into the inner cavity of the drill rod of the spiral drill rod A in a pressure mode, and injecting the concrete into the bottom of the variable-diameter plain concrete pile pit from the drill bit; starting a drilling machine, lifting the auger stem A upwards while rotating, and taking out soil in the variable-diameter plain concrete pile pit from bottom to top through a helical blade of the auger stem A;
step five, when concrete is poured to the inverted cone step, the position of a fixture block of the auger stem A corresponds to the position of a fixing hole in the auger stem B, the drilling machine stops, and two U-shaped clamp keys are inserted into the fixing hole on one side and clamped with the fixture block respectively and then exposed out of the fixing hole on the opposite side;
starting a drilling machine, driving a spiral drill rod A to drive a spiral drill rod B to synchronously lift upwards and simultaneously press and pour concrete, and driving soil at and above the inverted cone step out of the ground by the spiral drill rod B until the concrete is pressed and poured to the designed elevation; forbidding to lift the drill bit out of the concrete surface in the process of concrete pressure pouring;
and seventhly, after the variable-diameter plain concrete pile pit is filled with concrete, the spiral drill rod B is completely lifted to the ground, the spiral drill rod B is fixed on the drilling machine upright post by using the upper anchor ear and the lower anchor ear, the two U-shaped clamp keys are pulled out, and the drilling machine is moved to the next pile position.
The invention has the following positive effects: the invention can be reformed based on the original long spiral drilling machine, and the spiral drill rod B, the connecting device and the fixing device are simple to manufacture and low in cost. The movable spiral drill rod B is adopted, so that the spiral drill rod A is lifted when the spiral drill rod B reaches the reducing part, and the problem of insufficient soil left at the step is solved. Because the moment of torsion is great when creeping into, auger stem A and auger stem B need adopt flange joint, and the moment of torsion is less when promoting the pressure and irritating adopts U type card key to connect, and the installation is convenient, saves operating time, promotes the efficiency of construction. The construction equipment is simple to manufacture, convenient to operate, reliable in performance and low in use cost.
The construction method increases the area replacement rate of the shallow single pile by increasing the pile diameter of the upper part of the concrete pile, namely changing the variable pile diameter and the inverted frustum transition, achieves the aim of strengthening the foundation soil with relatively low shallow stratum strength in a targeted manner, and meets the requirement on deformation by adopting the relatively small pile diameter at the lower part, thereby achieving the aim of meeting the requirement on the bearing capacity of the foundation and the requirement on deformation and settlement and saving the engineering cost to the maximum extent.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of the connection state of a spiral drill rod A and a spiral drill rod B and a power head;
FIG. 3 is a schematic sectional view taken along line A-A of FIG. 1;
FIG. 4 is a schematic sectional view taken along line B-B of FIG. 1;
FIG. 5 is a schematic structural view of a drilling state of the auger stem A of the present invention;
FIG. 6 is a schematic view of the drilling state of the auger stem B of the present invention;
FIG. 7 is a schematic structural view of a drill lifting state of the auger stem A of the present invention;
FIG. 8 is a schematic view of a fixture block axis measuring structure according to the present invention;
FIG. 9 is a schematic cross-sectional view taken along line C-C of FIG. 7;
FIG. 10 is a schematic structural view of a work completion state of the present invention.
Detailed Description
As shown in fig. 1-10, the invention comprises a drilling machine 10 and an auger stem a1, wherein a drill bit 8 is fixedly arranged at the bottom of the auger stem a1, and a flange C9 is fixedly arranged at the bottom of a power head 13 of the drilling machine 10; the spiral drill pipe fixing device also comprises an auger stem B2, an upper connecting piece, a lower connecting piece and a fixing device; the auger A1 and the auger B2 are both hollow cavities, the length of the auger A1 is 5-25m, and the length of the auger B2 is 0.8-6 m; the outer diameter of the auger A1 is 0.18-0.58m, and the outer diameter of the auger B2 is 0.38-1.18 m. The inner diameter of the auger stem B2 is larger than the outer diameter of the auger blade of the auger stem A1, the auger stem A1 is sleeved in the inner cavity of the auger stem B2 and can rotate in the auger stem B2 during working; the upper connecting piece is fixed at the tops of the auger stem A1 and the auger stem B2 and is matched with the flange plate C9, and the lower connecting piece is arranged at the upper part of the auger stem B2 and the position corresponding to the auger stem A1; one end of the fixing device is hinged with the upright post of the drilling machine, and the other end of the fixing device is fixed on the auger stem B2 without influencing the drilling of the auger stem A1; the helical blade at the bottom of the auger stem B2 is provided with a diameter-variable section with the width being changed from narrow to wide from bottom to top along the helical direction, the helical blade at the bottom of the auger stem B2 is in the shape of an inverted frustum of 30-45 degrees from bottom to top along the helical direction, and the height of the inverted frustum is 0.15-0.8 m.
The upper connecting piece comprises a flange A3 fixedly arranged at the top of an auger stem A1 and a flange B4 fixedly arranged at the top of an auger stem B2, wherein the inner diameter of the flange B4 is larger than the outer diameter of the flange A3, the flange A3 and the flange B4 are matched with the flange C9, and the flange A3 is positioned in the inner cavity of the flange B4; the lower connecting piece comprises a fixing hole 5 arranged on the upper part of a drill rod B2, a U-shaped clamp key 6 inserted in the fixing hole 5 and a clamping block 7 fixed on the outer wall of the drill rod A1, wherein the outer wall of the clamping block 7 is provided with a clamping groove 14, the length of the clamping block 7 is smaller than the diameter of a helical blade of the auger rod A1, and the U-shaped clamp key 6 is clamped with the clamping groove 14 of the clamping block 7 when inserted in the fixing hole 5 to prevent the U-shaped clamp key 6 from moving; the two groups of fixing holes 5 are provided, and the two U-shaped clamping keys 6 are respectively inserted into the two groups of fixing holes 5 to be in a vertical state, so that the auger stem A and the auger stem B2 are firmly connected; the fixing device comprises an upper hoop 11 arranged at the upper part of the auger stem B2 and a lower hoop 12 arranged at the lower part of the auger stem B2; the other ends of the upper anchor ear 11 and the lower anchor ear 12 are hinged to the drill column 10, the upper anchor ear 11 is matched with the outer wall of the drill rod of the auger B2, and the lower anchor ear 12 is matched with the helical blade of the auger B2.
As shown in attached figures 1-10, the diameter-variable plain concrete pile construction equipment provided by the invention is used for constructing the diameter-variable plain concrete pile, and the following steps are adopted:
step one, an auger stem A1 is sleeved into a stem inner cavity of an auger stem B2, a flange A3 at the top of the auger stem A1 is fixed with a flange C9, an upper hoop 11 tightly holds the upper part of the auger stem B2, and a lower hoop 12 tightly holds a helical blade of the auger stem B2;
step two, starting the drilling machine 10, and drilling with the auger stem A1; when the auger stem A1 drills into the position where a constructor can conveniently operate and connect the auger stem A1 with the auger stem B2, the drilling machine 10 stops, the flange B4 and the flange C9 at the top end of the auger stem B2 are fixed by bolts, and the upper anchor ear 11 and the lower anchor ear 12 for fixing the auger stem B2 are opened;
step three, starting the drilling machine 10, enabling the auger stem A1 and the auger stem B2 to synchronously continue drilling until the designed diameter-variable plain concrete pile pit is drilled, stopping the drilling machine 10, detaching the flange plate 4 and the flange plate C9, and enabling the auger stem B2 to be retained in the diameter-variable plain concrete pile pit;
step four, concrete is grouted into the inner cavity of the auger stem A1 by pressure, and the concrete is injected into the bottom of the variable-diameter plain concrete pile pit from the drill bit 8; starting the drilling machine 10, lifting the auger stem A1 upwards while rotating, and taking out soil in the variable-diameter plain concrete pile pit from bottom to top through the helical blade of the auger stem A1;
step five, when concrete is grouted to the inverted cone step, the position of a fixture block 7 of the auger stem A1 corresponds to the position of a fixing hole 5 on the auger stem B2, the drilling machine 10 stops, and two U-shaped clamp keys 6 are inserted into the fixing hole 5 on one side and clamped with the fixture block 7 respectively and then are exposed from the fixing hole 5 on the opposite side;
sixthly, starting the drilling machine 10, driving the auger stem B2 to be synchronously lifted upwards by the auger stem A1, and simultaneously carrying out concrete pressure pouring, wherein the auger stem B2 carries the soil at the inverted cone step and above the inverted cone step out of the ground until the concrete pressure pouring reaches the designed elevation, namely, the height of the pile top is not less than 50mm above the designed elevation; the drill bit 8 is prohibited from being lifted out of the concrete surface in the process of concrete pressure pouring;
and seventhly, after the variable-diameter plain concrete pile pit is filled with concrete, the spiral drill rod B2 is completely lifted to the ground, the spiral drill rod B2 is fixed on the drilling machine upright post 10 by using the upper anchor ear 11 and the lower anchor ear 12, the two U-shaped clamp keys 6 are pulled out, and the drilling machine 10 is moved to the next pile position.
The construction equipment adopts the movable auger stem B2, so that the auger stem A1 is lifted when the auger stem B2 reaches the reducing part, and the problem of residual soil at the step of the inverted cone is solved. When drilling, the torque is large, the auger stem A1 and the auger stem B2 need to be connected through flanges, when pressure concrete filling is improved, the torque is small, the auger stem A1 and the auger stem B2 are connected through the U-shaped clamp key 6, installation is convenient, operation time is saved, and construction efficiency is improved.
The construction method increases the area replacement rate of the shallow single pile by increasing the pile diameter of the upper part of the concrete pile, namely changing the variable pile diameter and the inverted frustum transition, achieves the aim of strengthening the foundation soil with relatively low shallow stratum strength in a targeted manner, and meets the requirement on deformation by adopting the relatively small pile diameter at the lower part, thereby achieving the aim of meeting the requirement on the bearing capacity of the foundation and the requirement on deformation and settlement and saving the engineering cost to the maximum extent.
Claims (8)
1. A reducing plain concrete pile construction device comprises a drilling machine (10) and a spiral drill rod A (1), wherein a drill bit (8) is fixedly installed at the bottom of the spiral drill rod A (1), and a flange plate C (9) is fixedly installed at the bottom of a power head (13) of the drilling machine (10); the method is characterized in that: the drilling machine also comprises a spiral drill rod B (2), an upper connecting piece, a lower connecting piece and a fixing device; the drill rods of the spiral drill rod A (1) and the spiral drill rod B (2) are both hollow cavities, the length of the spiral drill rod A (1) is 5-25m, and the length of the spiral drill rod B (2) is 0.8-6 m; the inner diameter of a drill rod of the spiral drill rod B (2) is larger than the outer diameter of a spiral blade of the spiral drill rod A (1), and the spiral drill rod A (1) is sleeved in the inner cavity of the drill rod of the spiral drill rod B (2);
the upper connecting piece is fixed at the top of the auger stem A (1) and the auger stem B (2) and is matched with the flange C (9),
one end of the fixing device is hinged with the upright post of the drilling machine (10), and the other end of the fixing device is fixedly arranged on the spiral drill rod B (2);
the helical blade at the bottom of the auger stem B (2) is provided with a diameter-variable section with the width being changed from narrow to wide from bottom to top along the helical direction.
2. The variable-diameter plain concrete pile construction equipment according to claim 1, characterized in that: the upper connecting piece comprises a flange A (3) fixedly arranged at the top of the auger stem A (1) and a flange B (4) fixedly arranged at the top of the auger stem B (2), and the inner diameter of the flange B (4) is larger than the outer diameter of the flange A (3);
and the flange A (3) and the flange B (4) are matched with the flange C (9).
3. The variable-diameter plain concrete pile construction equipment according to claim 1, characterized in that: the lower connecting piece comprises a fixing hole (5) formed in the upper portion of a drill rod of the spiral drill rod B (2), a U-shaped clamping key (6) inserted into the fixing hole (5) and a clamping block (7) fixed to the outer wall of the drill rod of the spiral drill rod A (1), the U-shaped clamping key (6) is clamped with the clamping block (7) when being inserted into the fixing hole (5), and a clamping groove (14) is formed in the outer wall of the clamping block (7).
4. The variable-diameter plain concrete pile construction equipment according to claim 1, characterized in that: the two groups of fixing holes (5) are provided, and the two U-shaped clamping keys (6) are inserted into the two groups of fixing holes (5) respectively and then are in a vertical state.
5. The variable-diameter plain concrete pile construction equipment according to claim 1, characterized in that: the fixing device comprises an upper hoop (11) arranged at the upper part of the drill rod of the spiral drill rod B (2) and a lower hoop (12) arranged at the lower part of the spiral drill rod B (2); the other ends of the upper anchor ear (11) and the lower anchor ear (12) are hinged to a drill column (10), the upper anchor ear (11) is matched with the outer wall of the drill rod of the spiral drill rod B (2), and the lower anchor ear (12) is matched with the spiral blade of the spiral drill rod B (2).
6. The variable-diameter plain concrete pile construction equipment according to claim 1, characterized in that: the outer diameter of the auger stem A (1) is 0.18-0.58m, and the outer diameter of the auger stem B (2) is 0.38-1.18 m.
7. The variable-diameter plain concrete pile construction equipment according to claim 1, characterized in that: the spiral blade at the bottom of the spiral drill rod B (2) is in an inverted frustum shape of 30-45 degrees from bottom to top along the spiral direction, and the height of the inverted frustum is 0.15-0.8 m.
8. A construction method of a variable-diameter plain concrete pile is characterized by comprising the following steps:
step one, sleeving a spiral drill rod A (1) into a drill rod inner cavity of a spiral drill rod B (2), fixing a flange A (3) at the top of the spiral drill rod A (1) with a flange C (9), tightly holding the upper part of a drill rod of the spiral drill rod B (2) by an upper hoop (11), and tightly holding a spiral blade of the spiral drill rod B (2) by a lower hoop (12);
step two, starting the drilling machine (10), and drilling the spiral drill rod A (1); when the auger stem A (1) drills to a position where constructors can conveniently operate and connect the auger stem A (1) and the auger stem B (2), the drilling machine (10) stops, a flange B (4) at the top end of the auger stem B (2) and a flange C (9) are fixed through bolts, at the moment, the flange A (3) is located in the inner cavity of the flange B (4), and an upper anchor ear (11) and a lower anchor ear (12) for fixing the auger stem B (2) are opened;
step three, starting the drilling machine (10), enabling the spiral drill rod A (1) and the spiral drill rod B (2) to synchronously continue drilling until the designed diameter-variable plain concrete pile pit is drilled, stopping the drilling machine (10), detaching the flange plate (4) and the flange plate C (9), and enabling the spiral drill rod B (2) to be retained in the diameter-variable plain concrete pile pit;
step four, concrete is grouted into the inner cavity of the drill rod of the spiral drill rod A (1) in a pressure mode, and the concrete is injected into the bottom of the reducing plain concrete pile pit from the drill bit (8); starting a drilling machine (10), lifting the auger stem A (1) upwards while rotating, and taking out soil in the variable-diameter plain concrete pile pit from bottom to top through a helical blade of the auger stem A (1);
step five, when concrete is grouted to the inverted cone step, the position of a clamping block (7) of the auger stem A (1) corresponds to the position of a fixing hole (5) in the auger stem B (2), the drilling machine (10) stops, and two U-shaped clamping keys (6) are inserted into the fixing hole (5) on one side and clamped with the clamping block (7) respectively and then exposed from the fixing hole (5) on the opposite side;
step six, starting the drilling machine (10), driving the auger stem B (2) to be synchronously lifted upwards by the auger stem A (1) and simultaneously press-pouring concrete, and carrying out soil at and above the inverted cone step out of the ground by the auger stem B (2) until the concrete is pressed and poured to the designed elevation; the drill bit (8) is forbidden to be lifted out of the concrete surface in the process of concrete pressure pouring;
and seventhly, after the variable-diameter plain concrete pile pit is filled with concrete, the spiral drill rod B (2) is completely lifted to the ground, the spiral drill rod B (2) is fixed on the drilling machine upright post (10) by using the upper anchor ear (11) and the lower anchor ear (12), the two U-shaped clamping keys (6) are pulled out, and the drilling machine (10) is moved to the next pile position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911314710.0A CN110939395A (en) | 2019-12-19 | 2019-12-19 | Construction equipment and method for variable-diameter plain concrete pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911314710.0A CN110939395A (en) | 2019-12-19 | 2019-12-19 | Construction equipment and method for variable-diameter plain concrete pile |
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| Publication Number | Publication Date |
|---|---|
| CN110939395A true CN110939395A (en) | 2020-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911314710.0A Pending CN110939395A (en) | 2019-12-19 | 2019-12-19 | Construction equipment and method for variable-diameter plain concrete pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529716A (en) * | 2021-07-15 | 2021-10-22 | 闵瑞 | Positioning base device of hydraulic clamp for overwater steel pile |
-
2019
- 2019-12-19 CN CN201911314710.0A patent/CN110939395A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529716A (en) * | 2021-07-15 | 2021-10-22 | 闵瑞 | Positioning base device of hydraulic clamp for overwater steel pile |
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